Just a repository with additional emacs packages:
https://github.com/nix-community/emacs-overlay
Overlay is a nixos term: https://nixos.wiki/wiki/Overlays

On Fri, Jan 21, 2022 at 9:12 AM Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Евгений Курневский <kurnevsky@gmail.com> writes:
>
> > I use nixos with emacs-overlay, and in particular this version of emacs:
> >
> https://github.com/nix-community/emacs-overlay/blob/master/repos/emacs/emacs-unstable.json
>
> What is emacs-overlay?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>


-- 
С уважением, Курневский Евгений.